Fungalpedia – Note 2596, Koordersiella

 

Koordersiella Höhn.

Citation when using this data: Meng QF et al. – Fungalpedia.

Index Fungorum, Faceoffungi, MycoBank, GenBank, Fig 1.

Classification: Lophiotremataceae, Pleosporales, Pleosporomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi.

Koordersiella was established by Höhnel (1909) to accommodate the type species K. javanica Höhnel. This genus is characterized by small, black, regular perithecia with a multilayered perithecial wall, thin-walled 4–8-spored asci, and hyaline, cylindric to spindle-shaped ascospores (Pem 2019). Hawksworth (2016) considered K. javanica to be congeneric with Hansfordiellopsis aburiensis Deighton, which had been regarded as a synonym of Koordersiella insectivora (Hansf.) D. Hawksw. & O.E. Erikss. As a result, Hansfordiellopsis was synonymized with Koordersiella, and two species, Hansfordiellopsis tenuissima and H. variegata, were transferred to Koordersiella (Höhnel 1909, Hawksworth 2016). Lumbsch et al. (2010) placed Koordersiella in Dothideomycetes as genus incertae sedis in the outline of Ascomycota – 2019. Rossman et al. (2016) accepted this classification and recommended treating the genera Hansfordiellopsis Deighton and Ascohansfordiellopsis D. Hawksw. as synonyms of Koordersiella. Diederich et al. (2018a) listed six species in Koordersiella, including Hansfordiellopsis minuta D. Hawksw. which was not formally combined into the genus. Since we have not examined the type specimen and molecular data are unavailable, it was not included in the Koordersiella species list. Pem et al. (2019) re-examined the type specimen and placed Koordersiella within Lophiotremataceae based on morphological evidence.

According to Index Fungorum (2025), Koordersiella comprises seven species: five lichenicolous and two phytogenous (plant-associated). 

Type species: Koordersiella javanica Höhn.

Other accepted species: Species Fungorum – search Koordersiella

Figure 1 – Koordersiella javanica redrawn from Pem (2019). a Herbarium material. b Asci. c Ascospores. Scale bars: b = 20 μm, c = 10 μm.

 

References

Diederich P, Lawrey JD, Ertz D. 2018a – The 2018 classification and checklist of lichenicolous fungi, with 2000 non-lichenized, obligately lichenicolous taxa. The Bryologist 121 (3), 340–425.

Hawksworth DL. 2016 – A synopsis of the tropical pleomorphic lichenicolous genus Koordersiella (syn. Hansfordiellopsis) under a unified nomenclature. J Fungal Res 13, 227–232.

Höhnel F. 1909 – Fragmente zur Mykologie (VII. Mitteilung, Nr. 289 bis 353). Sitzungsberichten Kaiserliche Akad. Wiss. Wien Math. Naturwissenschaftliche Klasse Abt 118, 813–904.

Lumbsch HT, Huhndorf SM. 2010 – Myconet Volume 14. Part one. Outline of Ascomycota—2009. Part two. Notes on ascomycete systematics. Nos. 4751–5113. Fieldiana Life Earth Science 1, 1–64.

Pem D. 2019 – Mycosphere notes 275–324: A morpho-taxonomic revision and typification of obscure Dothideomycetes genera (incertae sedis). Mycosphere 10, 1115–1246.

Rossman AY, Allen WC, Braun U, Castlebury LA et al. 2016 – Overlooked competing asexual and sexually typified generic names of Ascomycota with recommendations for their use or protection. IMA fungus 7, 289–308.

 

Entry by

Meng QF, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand and School of Public Health, Zunyi Medical University, Guizhou 563000, China.

 

Published online 11 June 2026

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